> Return backwards in time and kill Hitler

Hum, could I suggest an evil alternative? Just schedule a few meetings with the people that lend money to Hitler and explain them that he will try to keep the money and will go to extreme measures to avoid returning it, including killing them or their relatives if possible. Really bad investment, don't touch this turd with a thousand foot pole. Thank me later when you still own your castle in Europe.

Result: Hitler never climb in a position to became Hitler. Nobody dies, nobody needs to enter in a war to recover the investment and you don't became a murderer. Hollywood would be devastated for sure but, apart of this...everybody wins :-)